Role of Carbon Bridge Length of Organosilicate Precursors on the Atmospheric Plasma Deposition of Transparent Bilayer Protective Coatings on Plastics

Dong, Siming; Han, Jiahao; Zhao, Zhimiao; Dauskardt, Reinhold H.

doi:10.1002/ppap.201600024

Cited by 5 publications

(4 citation statements)

References 23 publications

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“…The decrease of fracture energy with increasing Zr/GPTMS ratio was associated with decreasing poly(ethylene oxide) organic network formed in the coating system which decreased the overall coating plasticity contribution to G c , as discovered previously . The favored formation of ZrO x with increasing TPOZ content can also decrease the bilayer adhesion.…”

Section: Resultssupporting

confidence: 72%

“…For measuring the chemical composition depth profile of the deposited coatings, Argon ion beam was used as the sputtering source. Chemical structures within the coating were determined by transmission Fourier‐transform infrared spectroscopy (Nexus 670, Bruker Daltonics Inc., USA) with more detailed procedures described elsewhere . The contact angle of the spray layers before and after atmospheric plasma treatment were performed on a goniometer (Rame‐hart 290‐U1, Rame‐hart instrument co., USA).…”

Section: Methodsmentioning

confidence: 99%

“…However, due to the low surface hardness, they can be easily scratched which significantly reduces their optical qualities. Therefore, developing an effective transparent protective coating with both high hardness and adhesion is highly crucial . Wet chemistry techniques have been commercially employed to deposit transparent silica protective coatings, but their interfacial adhesions with plastic substrates are generally not quantified or in the low range .…”

Section: Introductionmentioning

confidence: 99%

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Optically Transparent Protective Coating for Plastics Using Dual Spray and Atmospheric Plasma Deposition

Ding

Dong

Han

et al. 2018

Adv Materials Inter

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deposited coatings are also low because of the low molecular network connectivity.To achieve coatings with better mechanical properties, we recently demonstrated an atmospheric plasma enhanced deposition technique for depositing transparent organosilicate coatings on plastic substrates with tunable mechanical properties. [9][10][11][12] The optimized bilayer coatings exhibited a twofold increase in adhesion energy with poly(methyl methacrylate) (PMMA) and a three-to fivefold improvement in surface hardness compared to the commercial sol-gel polysiloxane coatings. However, the debond interface still remained adhesively at the polymer and coating interface. Coatings with better adhesive properties which can drive cracks to propagate cohesively within the polymer substrate are highly desirable as it can provide better reliability and durability.In this study, we show the successful deposition of a bilayer protective coating on plastics using a combined spray and atmospheric plasma deposition method. A thin highly adhesive inorganic-organic hybrid coating on plastics was deposited using (3-glycidyloxypropyl) trimethoxysilane (GPTMS) and tetrapropyl zirconate (TPOZ) as precursors with spray coating deposition in air. Among different solution-based processing methods, spray deposition is highly desirable for making large-area, uniform coatings on various kinds of substrates through a simple and cost-effective process. [13] It is also able to coat complex 3D microstructures such as cantilevers and nonplanar surfaces for microelectromechanical systems applications. [14,15] It relies less on solution characteristics than substrate-contact based techniques and provides more flexibility on solvent choice, making it a more versatile process with less environment pollution. [16] Once hydrolyzed, the GPTMS precursor can form an inorganic molecular network via condensation reaction and an organic network via epoxide opening polymerization reaction. TPOZ precursor works as an effective catalyst to the epoxide opening reaction [17][18][19] and also acts as an inorganic network former to increase the inorganic network connectivity of the hybrid coating. After curing of the bottom spray layer, a hard top layer was deposited with atmospheric plasma deposition using tetraethyl orthosilicate (TEOS) as the precursor.The successful processing of bilayer protective coatings on plastics using a combined spray and atmospheric plasma deposition method is shown. The base layer is a spray deposited coating with high adhesion using (3-glycidyloxypropyl) trimethoxysilane and tetrapropyl zirconate (TPOZ) precursors. The top dense layer is deposited by atmospheric plasma deposition with a tetraethyl orthosilicate precursor. The coating deposition rate, chemical composition, elastic modulus, hardness, and adhesion to poly(methyl methacrylate) (PMMA) substrates are investigated. The adhesion to the polymer substrate is found to decrease with increasing TPOZ content in the precursor solution, while the elastic modulus and hardness of the base layer ...

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Section: Resultssupporting

confidence: 72%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optically Transparent Protective Coating for Plastics Using Dual Spray and Atmospheric Plasma Deposition

Ding

Dong

Han

et al. 2018

Adv Materials Inter

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“…Although this is an effective strategy, high crystallization temperatures and cumbersome vacuum processes are needed to achieve the desired coating crystallinity and composition. It is well known that the incorporation of organic constituents can increase the toughness and improve the mechanical properties of thin‐film oxide materials . An entire class of materials, organosilicates, have been developed around this concept.…”

Section: Introductionmentioning

confidence: 99%

Open Air Plasma Deposition of Superhydrophilic Titania Coatings

Hovish

Hilt

Rolston

et al. 2019

Adv Funct Materials

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A method for the deposition and functionalization of a nanostructured organotitanate thin film, which imparts superhydrophilicity to a surface with a one-step, open-air process, is described. Extreme wetting (Θ < 5°) is achieved through synergistic contributions from both nanoscale roughness, visible light absorption caused by nonmetal dopants, and oxygen vacancies and surface activation by reactive plasma species. To test the efficacy of this material as an antifog coating, glass is coated and subjected to aggressive changes in humidity. Under both fogging and defrosting conditions, the superhydrophilic coating achieves a high degree of transparency, showing nearly two orders of magnitude improvement over the bare glass. The measured adhesion of the superhydrophilic coating is 5.9 J m −2 , nearly double that of the solution-processed control. The reliability of the coating is further validated by demonstrating scratch-resistance. Additionally, the incorporation of organic matter into the molecular structure of the coating disrupts long-range crystallinity from developing. This structural and subsequent chemical analysis of the coating reveals that inorganic and organic species are intimately connected at the nanoscale via alkyl and alkoxy bridges. The amorphous organotitanate material is distinct from conventional TiO 2 , which requires high temperature crystallization and extensive UV irradiation to display similar superhydrophilic qualities.

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Tunable structure and connectivity of organosilica hybrid films by using different epoxy based precursors in atmospheric plasma deposition

Moriche

Ding

Dong

et al. 2020

Applied Surface Science

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Role of Carbon Bridge Length of Organosilicate Precursors on the Atmospheric Plasma Deposition of Transparent Bilayer Protective Coatings on Plastics

Cited by 5 publications

References 23 publications

Optically Transparent Protective Coating for Plastics Using Dual Spray and Atmospheric Plasma Deposition

Optically Transparent Protective Coating for Plastics Using Dual Spray and Atmospheric Plasma Deposition

Open Air Plasma Deposition of Superhydrophilic Titania Coatings

Tunable structure and connectivity of organosilica hybrid films by using different epoxy based precursors in atmospheric plasma deposition

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